Area Forecast Discussion
Issued by NWS Rapid City, SD

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592
FXUS63 KUNR 180507
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1007 PM MST Wed Jan 17 2018

.DISCUSSION...(This Evening Through Wednesday)
Issued at 214 PM MST Wed Jan 17 2018

Upper level analysis has large ridge over the western CONUS with
weak shortwave sliding across southern Canada. Skies are mostly
clear across the Northern Plains. At the surface, high pressure is
in control with light westerly winds across the area. Temperatures
at 2pm are in the 30s and 40s.

Western upper ridge will hold across the area for the next couple
of days, with Thursday being the warmest day. After a relatively
mild night across the area, temperatures will warm nicely on
Thursday, with highs in the upper 40s and 50s most locations. Some
low 60s will be possible along the eastern foothills and the Rapid
City area. Southwest winds will be breezy across northeast
Wyoming.

Clouds will be on the increase Thursday night into Friday with
mild conditions continuing. Temperatures will be slightly cooler
on Friday, but still well above average.

The next weather system to affect the area moves into northeast
Wyoming and southwest South Dakota Friday night, spreading across
South Dakota on Saturday and Sunday. GFS and EC differ slightly
on snow amounts, with GFS snow possibilities further north.
Regardless, several inches will be possible for locations south of
Interstate 90 from Saturday into Sunday morning. Temperatures
will cool into the 20s and 30s during this period.

Weak ridging moves into the area early next week with near average
temperatures expected.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Thursday Night)
Issued At 1006 PM MST Wed Jan 17 2018

VFR conditions will continue through the forecast period.
Windy conditions will develop over northeastern Wyoming on
Thursday evening.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...15
AVIATION...10



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